PATELLAR TENDON

Abnormalities of the patellar tendon are an important cause of anterior knee pain.
Because the structure runs between two bones it is sometimes referred to as the patellar ligament. The histology of the patellar tendon is however that of a true tendon rather than a ligament.

OSGOOD SCHLATTERS DISEASE
Childhood osteochondrosis of the patellar tendon insertion.
The aetiology is uncertain, there is an association with athletic children.
Possibly a traction enthesopathy which results in:
      • new bone formation at the tibial tubercle
      • tendinopathy of the distal patellar tendon
      • Deep infrapatellar bursitis.

Palpable overgrowth of the tibial tubercle makes the clinical diagnosis is easy.
Plain radiographs are most often requested however
in ultrasound examination provides a better depiction of the bony and soft tissue abnormalities.
Similar findings are present on MR examinations.

SINDIG LARSEN DISEASE
Equivalent condition at the proximal end of the patellar tendon
Less common than OSD

JUMPERS KNEE
focal patellar tendinopathy or jumpers knee affects the central third of the patellar tendon particularly its posterior margin.
Frequently associated with running and jumping sports.
The aetiology is uncertain.
Possible impingement of the lower pole of the patellar against the dorsal aspect of the patellar tendon
In late cases enthesopathy and bony overgrowth of the lower pole of the patellar is seen